Combination transformer and circuit-breaker.



W.' -M. McCONAHEY. COMBINATION TRANSFORMER AND CIRCUIT BREAKER.

APPLICATION FILED 952131, 1913.

1,270,850; Patented Jul 2,1918.

wnNEssEsf INVENTO ATTORNEY UNITED STATES PATENT OFFICE.

WILLIAM M. McCbNAHEY, or PITTSBURGH, PENNSYLVANIA; ASSIGNOR TO WESTING- HOUSE ELEoTnI-c AND MANUEAGTURING-COMBANY, A CORPORATION or PENNSYL- .VANIA.

COMBINATION rnnnsromu'nn AND oration-BREAKER.

Patented July 2, 1918.

Application n t beater ai, 1913; Serial mjrssnve.

To all whom it may concern Be it known that I, \vmLnierr;'-' Mcoi{A-; HEY, a citizen of the United States,- and a resident of Pittsburgh, in the county'fof Allegheny and State of Pennsylvania, have invented a new and useful Improvement in Combination Transformers "and Circuit Breakers, of which the following is a specification.

My invention relates to electrical apparatus, and it has for its object toprovide an .improved means for the disposition of'eiecytrical apparatus that shall be specially simple and economical of space and that shall involve the use of a minimum number of insulating bushings.

High-voltage transformers are usually po-.

sitioned ininclosing cases or tanks which serve as a protective means and which contain oil ,or other; insulating fluid adapted for cooling and for (insulating the coils of the transformer. In order to transmit the energy torafid fifrom the transformer, it is necessary to" provide suitable bushings through which leads or conductors connected to thetran'sformer coils may extend.

Similarly, insulators must be employed with the circuit; interrupter associated with the transformer for protecting the leads which connect transformer coils and the transmission conductors to the switching memhersv of the circuit interrupter. On highvoltage circuits, the expense involved in supplying these insulating bushings is considerable.

According to my invention, I place a high-tension transformer in a case which bushings also being common .to the case containing the circuit interrupting apparatus.

' In this way, I reduce the number of insulating bushings required forthe above-mentioned combination For a betterunderstanding of the nature,

the scope and the characteristic features of.

my invention, reference may be had to the following description and the accompanying drawing in which the single figure is aview,

partially in elevation and-partially in sec- .tion, of a device embodying a form of mv invention.

Referring to the drawing, a transformer 1 is contained in a tankc2. which is provided with a solid cover 3. Leads-4, connected to.

I the terminals 5 of a high-tension winding (3, pass through high-tension bushings 7 which Energy is supplied from a source (not shown) through leads '14 to alow-tension winding 15 of the transformer 1. The leads 14 are insulated from the case 2 by means of low-tension bushings 16 which may be of any suitable construction. By reason of the high voltage induced in the winding 6, bushings 7 mustbe constructed to withstand the potential strains imposed thereupon, and, consequently, the cost of supplying the said bushings is considerable. By placing the case 2 of the transformer and the case13 ofthe circuit interrupter a short distance from each other, and by providing the walls thereof with properly positioned openings,

the bushings 7 mayv be utilized to insulate the high-tension leads 4 from the, transformer case 2 and the'circuit interrupter A case 13. By the arrangement of apparatus substantially shown in the-drawing, the cover .3 of the transformer tank 2 may be cast solid, inasmuch as it is not necessary to furnish the said cover with high-potential outlet bushings.

From the foregoing description, it is apparent that'I provide the transformer and the circuit interrupter with a minimum number of bush'ngs and also maintain the said'devices indistinct and separate inclosing cases. In addition to saving the cost'of supplying numerous high-tension bushings required in the/usual arrangement, I provide anefi'ective combination which requires a smallyamount of installation space. Particularly is this. true when condenser-type bushings are employed, as in the present case. It is well known that the length of the stepped-off portion at the end of a condenser-type bushing is a: function of the potential for which said bushing is designed, the length of said stepped-off portion being considerable with'ahigh-tension bushing. By employing; a single bushing-for each lead, as herein indicated, the iiecessityof locating steppedofi' portions, of permissible length, between the two containers is axoidedand said containers may. therefore, be much more closely located than would otherwise be possible. Again, my invention may be advantageously employed in outdoor installations, inasmuch as the cost of the equipment will be considerably less than that furnished heretofore for similar service.

I claim as my invention:

1. The combination with a main electrical apparatus, a containing case therefor,

and a second case containing an auxiliary apparatus, of rigid condenser type insulatmg bushings that pro eet into both of said cases for the electrical connectors between insulating bushings common to both cases and supported in the Walls thereof, and con- 3. The combination With a main electrical apparatus, a containlng case therefor, a case containing circuit interrupting means for said main electrical apparatus, said second case being spaced a short distance from said first containing case, of condenser-type insulating bushings common to both cases and supported in the Walls thereof, whereby connectors between said main and auxiliary apparatus may be electrically insulated from the said cases.

In testimony whereof, I have hereunto subscribed my name this 22nd day of Oct., 1913.

iVILLIAl/i M. MGCONAHEY.

Witnesses:

GHAnLEs Fonrnsoun, B. B. HINES. 

